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There are 11 Interstate Highways—5 primary and 6 auxiliary—that exist entirely or partially in the U.S. state of South Carolina.As of December 31, 2013, the state had a total of 850.80 miles (1,369.23 km) of interstate and 11.80 miles (18.99 km) of interstate business, all maintained by the South Carolina Department of Transportation (SCDOT).
South Carolina utilizes a numbering system to keep track of all non-interstate and primary highways that are maintained by SCDOT. First appearing in 1947 [citation needed] (when a huge amount of highways were cancelled or truncated), the "state highway secondary system" [4] carries the number of the county followed by a unique number for the particular road.
Interstate 222 (I-222) is a future auxiliary Interstate Highway that will be a connector between I-22 and the proposed I-422 near Birmingham, Alabama. There will be no exits other than its termini. The highway has been proposed because an interchange directly between I-22 and I-422 cannot be built due to environmental issues. [22]
Originally, both Carolinas selected a route running south from Rockingham, North Carolina. However, North Carolina had more money to spend on roads, [6] and, on May 10, 1995, the US Senate Environment and Public Works Committee approved North Carolina's plan for I-73 to run eastward to the coast and enter South Carolina at North Myrtle Beach. [7]
Interstate 20 (I-20) is the main east–west Interstate Highway in the state of South Carolina, linking the state with important transportation and business hubs to the north, west, and south, including Atlanta, Georgia; Charlotte, North Carolina (via I-77); Savannah, Georgia (via I-95); and Washington, D.C. (via I-95).
Portions of I-26, I-126 and I-20 will be under construction for the next eight years, as the state’s Department of Transportation begins work on a $2.08 billion project to overhaul the roadways.
[4] [6] The General Reimbursement Act, passed in 1926, "authorized counties to issue bonds for highway construction" and the 1929 State Highway Bond Act "enabled the highway department to fund construction of a statewide highway system by issuing bonds, allowing the agency to abandon its pay-as-you-go formula." [4]
0–9. Interstate 20 in South Carolina; Interstate 20 Business (Florence, South Carolina) Interstate 520; Interstate 26 in South Carolina; Interstate 126